console warning: "Too many lights in the scene !!!"
For questions like this please indicate what render engine you are using. Eevee has a limit of 128 lights in a scene.
Read:
https://docs.blender.org/manual/en/latest/render/eevee/limitations.html
Also, for simulated LED arrays you might want to consider a single texture as part of an emission shader.
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and
How to control many tiny lights